Polycarbonates having a good wettability
AssigneeBayer MaterialScience AG
InventorsAlexander Meyer, Wilfried Haese, Stephan Konrad, Claus-Ludolf Schultz
Life of this patent
Estimating the term…
Abstract
Polycarbonate resin containing small amounts of carbamate compounds is disclosed. The resin that contains at least one of compounds conforming to wherein R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene, R3 and R4 independently of one another represent hydrogen, C1-C12-alkyl, or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, and R5 denotes hydrogen, C1-C12-alkyl, C5-C12-cycloalkyl, phenyl or cumyl, are characterized by their low electrostatic field and therefore suitable for making optical storage media.
Claims9
A polycarbonate resin containing
- 0.2 to 300 ppm of one or more compounds conforming structurally to formula (I)
- wherein
- R1 and R2 independently of one another denote hydrogen or C1-C12-alkyl, or together denote C4-C12-alkylidene,
- R3 and R4 independently of one another represent hydrogen, C1-C12-alkyl, or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, and
- R5 denotes hydrogen, C1-C12-alkyl, C5-CI2-cycloalkyl, phenyl or cumyl,
- wherein the content is measured in acetone extract by chromatography by means of HPLC.
9, A polycarbonate resin containing
- 0.2 to 500 ppm of compounds conforming to formula (4)
- wherein R1, R2, R3 and R4 have the meaning given for formula (1), where the contents is measured by HPLC in the acetone extract after alkaline hydrolysis with sodium hydroxide solution.
Dependencies are inferred from the claim text.